Quiz about Exponential equations 1

Question 1

Which of the following functions shows an initial amount of $15 and an increase of 35% each year?

Accepted Answer

y = 15(1.35)^x

Answer

y = 15(35)^x

Answer

y = 15(0.35)^x

Answer

y = 35(1.15)^x

Question 2

Classify the model as Exponential GROWTH or DECAY.
A=1200(.85)⁶

Accepted Answer

Decay

Answer

Growth

Question 3

Classify the model as Exponential GROWTH or DECAY.
A=10(1.01)³

Accepted Answer

Growth

Answer

Decay

Question 4

Is the pictured graph growth, decay, or linear or none?

Accepted Answer

Exponential Growth

Answer

Exponential Decay

Answer

Linear

Answer

None

Question 5

The number of mosquitoes at the beginning of the summer was 4,000. The population of mosquitoes is expected to grow at a rate of 25% a month. How many mosquitoes will there be after 4 months?

Accepted Answer

9765

Answer

9766

Answer

9006

Answer

5433

Question 6

Suppose a culture of bacteria begins with 5000 cells and dies by 30% each year. Write an equation that represents this situation.

Accepted Answer

y=5000(0.7)^x

Answer

y=30(5000)^x

Answer

y=5000(1.3)^x

Answer

y=5000xx

Question 7

What is the domain of the function shown below?

Accepted Answer

All Real Numbers

Answer

-2 < x < 5

Answer

0 < x < 12

Answer

y > 0

Question 8

Which represents exponential decay?

Accepted Answer

D

Answer

A

Answer

B

Answer

C

Question 9

Which does y= 2(.5)^xrepresent?

Accepted Answer

Exponential Decay

Answer

Exponential Growth

Question 10

Which does y=.5(2)^x represent?

Accepted Answer

Exponential Growth

Answer

Exponential Decay

Question 11

What is the initial value of the situation represented by f(x)=0.05(2)^x?

Accepted Answer

0.05

Answer

2

Answer

0.1

Answer

1

Question 12

The population of Winnemucca, Nevada, can be modeled by P=6191(1.04)^twhere t is the number of years since 1990. What was the population in 1990?

Accepted Answer

6191

Answer

0 people

Answer

It doesn't say

Answer

I don't know

Question 13

The population of Winnemucca, Nevada, can be modeled by P=6191(1.04)^t where t is the number of years since 1990. What percent did the population increase each year?

Accepted Answer

4%

Answer

It doesn't say

Answer

I don't know

Answer

400%

Question 14

You have inherited land that was purchased for $30,000 in 1960. The value of the land increased by approximately 5% per year. What is the approximate value of the land in the year 2011?

Accepted Answer

$344,022

Answer

$31,500

Answer

$15,000

Answer

$28,500

Question 15

You drink a beverage with 120 mg of caffeine. Each hour, the caffeine in your system decreases by about 12%. How long until you have 10mg of caffeine?

Accepted Answer

19 to 20 hours

Answer

10 to 20 hours

Answer

15 to 16 hours

Answer

5 to 6 hours

Exponential equations 1

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